the obama administration has decided to turn down the volume. white house correspondent dan lothian live from washington with more. dan, are the north koreans very difficult to gauge. obviously these things are just fraught with tension. earlier here this week the north koreans called americans boiled pumpkins. the rhetoric is very strange. at the same time, the u.s. has to be very careful not to back them in a corner. >> that is true. the sense at least according to that report is that perhaps kim jong-un may have been pushed much further than they intended and that's why they intend to dial things back. the u.s. has really been ramping up its presence in the region starting early last month, march 8th, when the b-52 bombers were sent to fly over south korea. u.s. officials saying that was par of a routine mission. they followed up that about 2 1/2 weeks later with another similar mission. then came those stealth bombers. followed that earlier this week with navy warships going to the region to better monitor the situation inside north korea. a